[ci] now revert to Ubuntu 18.04, see if docker can work or not

.github/workflows/build.yml

@@ -67,7 +67,7 @@ jobs:
     needs: change_detect
     if: ${{ fromJSON(needs.change_detect.outputs.source_modified) }}
     name: ${{ matrix.config.name }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     # Note: dependencies are installed in the container. See details about dependency list in docker/Dockerfile.master
     # Comment the line out when base image is built again
     #container: ghcr.io/${{ needs.change_detect.outputs.docker_repo }}/openfpga-build-${{ matrix.config.cc}}
@@ -76,31 +76,31 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - name: "Build Compatibility: GCC-7 (Ubuntu 20.04)"
+          - name: "Build Compatibility: GCC-7 (Ubuntu 18.04)"
             cc: gcc-7
             cxx: g++-7
-          - name: "Build Compatibility: GCC-8 (Ubuntu 20.04)"
+          - name: "Build Compatibility: GCC-8 (Ubuntu 18.04)"
             cc: gcc-8
             cxx: g++-8
-          - name: "Build Compatibility: GCC-9 (Ubuntu 20.04)"
+          - name: "Build Compatibility: GCC-9 (Ubuntu 18.04)"
             cc: gcc-9
             cxx: g++-9
-          - name: "Build Compatibility: GCC-10 (Ubuntu 20.04)"
+          - name: "Build Compatibility: GCC-10 (Ubuntu 18.04)"
             cc: gcc-10
             cxx: g++-10
-          - name: "Build Compatibility: GCC-11 (Ubuntu 20.04)"
+          - name: "Build Compatibility: GCC-11 (Ubuntu 18.04)"
             cc: gcc-11
             cxx: g++-11
-          - name: "Build Compatibility: Clang-6 (Ubuntu 20.04)"
+          - name: "Build Compatibility: Clang-6 (Ubuntu 18.04)"
             cc: clang-6.0
             cxx: clang++-6.0
-          - name: "Build Compatibility: Clang-7 (Ubuntu 20.04)"
+          - name: "Build Compatibility: Clang-7 (Ubuntu 18.04)"
             cc: clang-7
             cxx: clang++-7
-          - name: "Build Compatibility: Clang-8 (Ubuntu 20.04)"
+          - name: "Build Compatibility: Clang-8 (Ubuntu 18.04)"
             cc: clang-8
             cxx: clang++-8
-          - name: "Build Compatibility: Clang-10 (Ubuntu 20.04)"
+          - name: "Build Compatibility: Clang-10 (Ubuntu 18.04)"
             cc: clang-10
             cxx: clang++-10
     # Define the steps to run the build job
@@ -192,7 +192,7 @@ jobs:
             ghcr.io/${{ needs.change_detect.outputs.docker_repo }}/openfpga-master:${{ needs.change_detect.outputs.sha_short }}
   linux_regression_tests:
     name: linux_regression_tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     needs: [linux_build, change_detect]
     container: ghcr.io/${{ needs.change_detect.outputs.docker_repo }}/openfpga-env
     strategy:
@@ -247,7 +247,7 @@ jobs:
     needs: change_detect
     if: ${{ !fromJSON(needs.change_detect.outputs.source_modified) }}
     name: docker_regression_tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     container: 
       image: ghcr.io/${{ needs.change_detect.outputs.docker_repo }}/openfpga-master:latest
       options: --user root --workdir /home/openfpga_user
@@ -275,7 +275,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           submodules: true
-      - name: ${{matrix.config.name}}_GCC-8_(Ubuntu 20.04)
+      - name: ${{matrix.config.name}}_GCC-8_(Ubuntu 18.04)
         shell: bash
         run: |
           bash .github/workflows/install_dependencies_run.sh

docker/Dockerfile.base

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:18.04
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install software-properties-common -y
 # 18.04 includes 2.17 but github requires 2.18+ to support submodules.

docker/Dockerfile.env

@@ -11,4 +11,4 @@ RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
 RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
 ADD requirements.txt requirements.txt
 ENV PYTHON_EXEC=python3.8
-RUN ${PYTHON_EXEC} -m pip install -r requirements.txt
+RUN ${PYTHON_EXEC} -m pip install -r requirements.txt